#[derive(Debug)]
struct B {
    num : u8,
}

#[derive(Debug)]
struct A {
    name : String,
    age : B,
}


fn main() {
    println!("Hello, world!");
    let b = A{
        name:"anpeng".to_string(),
        age : B {
            num:10,
        }
    };
    println!("{:#?}",b);

}
